/jp/ - Otaku Culture

How heavily does 天使の羽根を踏まないでっ delve into Christian mythology? I just finished itsusora and for that, I ended up making myself spend a few hours reading up on stuff about Norse Mythology before I got too far in. I know that this one is supposed to be more accessible, so I doubt it uses it to that great of an extent, but how much would I be missing out if I don't actually read up on anything?

On a side note, do you get to fuck Sora?